Provided a url and a path relative to that url, this function will return the resulting absolute url

getAbsoluteUrl.js

var getAbsoluteUrl = function(url, path) {
    if(url.substr(-1) == '/') {
      url = url.substr(0, url.length-1);
    }
    
    var path = path;
    if(path !== null) {

    	if(url.substr(-1) == "/") {
		    url = url.substr(0, url.length-1);
		}

		while(/^\.{1,2}\//i.test(path)) {
            if(/^\.{1}\//i.test(path)) {
                path = path.substr(2,path.length);
            } else {
                var url_arr = url.split('/');
    		    url_arr.pop();
    		    url = url_arr.join("/");
                path = path.substr(3,path.length);
            }
		}

        url = url + "/" + path;
    }

    return url;
}